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Old 25th July 2010, 09:24 AM   #1
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Default Tekko plans UcD

I started thinking about building a class d using only discrete components.

Heres the first draft:
Click the image to open in full size.

Note that its single sided since i had requests of also releasing my layouts as just single sided.

Im gonna redo it as double sided later on.
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Old 25th July 2010, 06:39 PM   #2
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Double sided version:
Click the image to open in full size.
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Old 25th July 2010, 07:54 PM   #3
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Why everything though-hole???
Where are the gate resistors?
P.S. forget about single layer
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Old 25th July 2010, 08:43 PM   #4
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Heres the original schematic:
http://www.nxp.com/documents/user_manual/UM10155.pdf

Heres my schematic:
Click the image to open in full size.

Why all through hole ? Because i dont have any smd components and due to my budget i have to make do with the components i already have.
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Old 26th July 2010, 05:03 AM   #5
MOER is offline MOER  United States
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Default Ucd

The inductance of leaded parts will hurt your design. It is almost impossible to obtain a stable amplifier with good performance with leaded parts.


Steve

Zed Audio
Los Angeles CA
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Old 26th July 2010, 06:56 AM   #6
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I know that! Now i dunno what switching frequency RX5's amp was but his worked just fine with all though hole components so i figure mine should too.

My amp will have a designed max power output of 30 watts with 18V rails.

Anyways if it doesent work out i always have that other design to go with.
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Old 26th July 2010, 08:42 AM   #7
stewin is offline stewin  Kenya
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nice work tekko i've experimented on ucd's but i used stripped boards. i liked the sound but i got problems with output fets heating . but when i reduced the value of r15 and r17 sought of solved the problem. here is another scheme i found quite amazing with protection and op amp input
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Old 27th July 2010, 08:49 PM   #8
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It can work with leaded parts, but it will radiate much more RF, increasing the chances of disturbing or increasing the noise floor of other circuits near.

Avoiding it to disturb itself is just the first step.

"hi-fi grade" low EMI can only be achieved with SMD and two or more layers in the PCB.
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Last edited by Eva; 27th July 2010 at 08:52 PM.
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Old 27th July 2010, 09:06 PM   #9
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SMD is actually just pushing it all up in frequency just like you wrote about those directfets some years ago.

Now the leads would be really short much like the legs on a IR2010 but i guess its the quantity, 2-3 legs per component, but the pcb traces are like 10x longer both on my version and on a smd version.

Anyways im prolly gonna go with the LM311 and IR2010 design in the other thread first, and maybe do some experiments with the bca topology.
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Old 30th July 2010, 07:13 AM   #10
stewin is offline stewin  Kenya
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hi tekko what frequecy are you using ?
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